Lee, Hyun Woong
Lee, Jung Il
Kim, Saein
Kim, Sora
Chang, Hye Young
Lee, Kwan Sik
Funding for this research was provided by:
Yonsei University College of Medicine (6-2019-0091)
Article History
Received: 13 October 2019
Accepted: 25 March 2020
First Online: 18 April 2020
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Gangnam Severance Hospital. As this study was a retrospective design, written consent was not required.
: Not Applicable.
: Hyun Woong Lee is a member of the editorial board of BMC gastroenterology.The other authors declare that they have no competing interests.